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第 36 卷第 4 期 精 细 化 工 Vol.36, No.4
201 9 年 4 月 FINE CHEMICALS Apr. 2019

功能材料
GA-g-PAA/ST 复合水凝胶的合成与表征

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王雪妮，徐继红 ，何梦奇，杨忠连
（安徽理工大学 化学工程学院，安徽 淮南 232001）

摘要：以阿拉伯胶（GA）、丙烯酸（AA）、海泡石黏土（ST）为原料，采用微波辐射法，通过接枝共聚合成了
GA-g-PAA/ST 复合水凝胶，利用 FTIR、XRD 和 SEM 表征了水凝胶的结构和形貌，用 TG 分析了水凝胶的热稳
定性能，同时探讨了水凝胶在不同价态阳离子盐溶液的溶胀行为和保水性能。结果显示：GA、ST 和 AA 发生
了接枝共聚反应，共聚物插层到 ST 的层间，形成剥离型均匀的三维网络复合高吸水性水凝胶。当盐溶液浓度为
20 mmol/L 时，水凝胶在 NaCl、BaCl 2 、AlCl 3 溶液中的吸水倍率分别为 112、38 和 29 g/g。表面活性剂溶液浓
度为 20 mmol/L 时，水凝胶在十二烷基硫酸钠(SDS)和十六烷基三甲基溴化铵(CTAB)溶液的吸水倍率分别为 135
和 105 g/g。水凝胶在 NaCl 和 BaCl 2 溶液经过 3 次溶胀-去溶胀循环后，其吸水倍率分别为 80 和 12 g/g，表明水
凝胶在 NaCl 和 BaCl 2 盐溶液中具有较强的盐响应性能和良好的可逆行为，水凝胶具有较好的热稳定性和保水性
能。
关键词：高吸水性水凝胶；阿拉伯胶；海泡石；接枝共聚；保水性能；功能材料
中图分类号：TQ424.3 文献标识码：A 文章编号：1003-5214 (2019) 04-0633-06

Synthesis and Characterization of a GA-g-PAA/ST Composite Hydrogel

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WANG Xue-ni, XU Ji-hong , HE Meng-qi, YANG Zhong-lian
（School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China）

Abstract: A novel GA-g-PAA/ST composite hydrogel was prepared by graft copolymerization of gum
arabic (GA), acrylic acid (AA), and sepiolite clay (ST) under microwave irradiation. The structure and
morphology of GA-g-PAA/ST composite hydrogel were characterized by FTIR, XRD and SEM. The
thermal stability of the hydrogel was analyzed by TG. The swelling behavior and water retention of the
hydrogel in different cationic salt solutions were also discussed. The results showed that the graft
copolymerization reaction of GA, ST, and AA took place, and the copolymer intercalated into the interlayer
of ST to form a delaminated three-dimensional network composite hydrogel. When the concentration of salt
solution was 20 mmol/L, the absorbency of GA-g-PAA/ST in NaCl solution, BaCl 2 solution, and AlCl 3
solution was 112, 38 and 29 g/g, respectively. The absorbency of GA-g-PAA/ST in 20 mmol/L sodium
dodecyl sulfate (SDS) solution and 20 mmol/L hexadecyl trimethyl ammonium bromide (CTAB) solution
was 135 and 105 g/g, respectively. After repeating three cycles of swelling and deswelling by a solution of
NaCl and BaCl 2, the absorbency of the hydrogel was 80 and 12 g/g, respectively, indicating that the
hydrogel had strong salt responsive property and good reversible behavior in the solution of NaCl and
BaCl 2 . The hydrogel had good thermal stability and water retention capacity.
Key words: superabsorbent hydrogel; gum arabic; sepiolite clay; graft copolymerization; water retention
capacity; functional materials
Foundation item: Anhui University Natural Science Foundation (KJ2016A197)

交联高分子水凝胶是具有三维网络结构的水溶 量几十倍甚至上千倍的水或水溶液，同时具有良好
胀型功能高分子吸水材料，能够吸附相当于自身质 的吸水、保水性能 [1-2] 。水凝胶被广泛应用于医药、

收稿日期：2018-08-09; 定用日期：2018-12-24; DOI: 10.13550/j.jxhg.20180586
基金项目：安徽高校自然科学研究项目（KJ2016A197）
作者简介：王雪妮（1995—），女，硕士生。联系人：徐继红（1968—），女，副教授，E-mail: ahlgxjh@sina.com。